# -*- coding: utf-8 -*-
def convert(imgf,labelf,outf,n):
    f=open(imgf,'rb')
    o=open(outf,'w')
    l=open(labelf,'rb')
    f.read(16)
    l.read(8)
    images=[]
    for i in range(n):
        image=[ord(l.read(1))]
        for j in range(28*28):
            image.append(ord(f.read(1)))
        images.append(image)
    for image in images:
        o.write(",".join(str(pix) for pix in image)+"\n")
    f.close()
    o.close()
    l.close()
convert("train-images.idx3-ubyte","train-labels.idx1-ubyte","mnist_train.csv",60000)
convert("t10k-images.idx3-ubyte","t10k-labels.idx1-ubyte","mnist_test.csv",10000)

